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Elucidation of new functions of cancer-specific BIG3 protein for drug discovery

Research Project

Project/Area Number 19K07643
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 50010:Tumor biology-related
Research InstitutionThe University of Tokushima

Principal Investigator

AIBARA Hitoshi  徳島大学, 先端酵素学研究所, 特任助教 (80587717)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsミトコンドリア / TNBC / 乳がん / がん
Outline of Research at the Start

がん細胞の増殖・進展が特定のがん遺伝子によるシグナル伝達経路の活性化に強く依存するという概念(Oncogene addiction:がん遺伝子中毒)は、分子標的治療の理論的基盤である。本研究は、がん特異的タンパク質BIG3によるOncogene addictionの仕組みを明らかにすることを目的とし、BIG3複合体の機能を解析する。将来的にBIG3複合体を分解し、がん細胞増殖の抑制を狙いとした創薬ペプチドの開発を行うための研究基盤を確立する。

Outline of Final Research Achievements

We demonstrate that Brefeldin A-inhibited guanine nucleotide-exchange protein 3 (BIG3) large complex consists of Prohibitin 2 (PHB2), a pleiotropic mitochondrial regulator and several mitochondrial factors maintaining mitochondrial structure and function in triple-negative breast cancer (TNBC) cells. Crucially, either BIG3 knockdown or treatment with a competitive inhibitory peptide (stERAP) targeting BIG3-PHB2 interaction caused abnormal elongation of mitochondria substantially dissimilar to mitochondrial fusion, leading to drastic inhibition of TNBC cell growth. Remarkably, stERAP dissociates not only PHB2 but also other BIG3 interactors from BIG3, resulting in the functional deficiencies of mitochondria. Our results strongly suggest that BIG3 integrates the pathophysiological states of mitochondria, implying the BIG3-PHB2 axis as a potential target for TNBC therapy.

Academic Significance and Societal Importance of the Research Achievements

エストロゲン受容体、プロゲステロン受容体、HER2いずれも陰性のトリプルネガティブ乳がん(TNBC)は、高再発率かつ予後不良であり、明確な治療法が確立されていないため、新たな治療標的の同定、治療法の革新的アイデアが望まれる。本研究によって、TNBCにおいて、BIG3-PHB2を中心としたミトコンドリア因子巨大ネットワークが、ミトコンドリアの構造・機能維持に必須であり、同時にTNBCの脆弱性であることが示され、新たな治療標的の可能性が期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (8 results)

All 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (7 results)

  • [Journal Article] The survival and proliferation of osteosarcoma cells are dependent on the mitochondrial BIG3‐PHB2 complex formation2021

    • Author(s)
      Toki Shunichi、Yoshimaru Tetsuro、Matsushita Yosuke、Aihara Hitoshi、Ono Masaya、Tsuneyama Koichi、Sairyo Koichi、Katagiri Toyomasa
    • Journal Title

      Cancer Science

      Volume: 112 Issue: 10 Pages: 4208-4219

    • DOI

      10.1111/cas.15099

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] トリプルネガティブ乳癌細胞においてBIG3-PHB2複合体は癌病態ミトコンドリアを安定制 御する2021

    • Author(s)
      相原仁 吉丸哲郎 片桐豊雅
    • Organizer
      第25回 日本がん分子標的治療学会学術集会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Exploiting vulnerabilities of triple negative breast cancer by targeting the mitochondrial BIG3-PHB2 large complex2021

    • Author(s)
      相原仁、吉丸哲郎、尾野雅哉、笹三徳、三好康雄、片桐豊雅
    • Organizer
      第80回 日本癌学会学術総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Exploiting cancer-associated vulnerabilities of mitochondrial BIG3-PHB2 axis in clinical therapeutics for triple negative breast cancer2021

    • Author(s)
      相原仁、吉丸哲郎、尾野雅哉、笹三徳、三好康雄、片桐豊雅
    • Organizer
      第44回 日本分子生物学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Mitochondrial BIG3-PHB2 complex in triple negative breast cancer cells: A potential target for clinical treatment2020

    • Author(s)
      Hitoshi Aihara, Tetsuro Yoshimaru, Masaya Ono, Mitsunori Sasa, Yasuo Miyoshi, Toyomasa Katagiri
    • Organizer
      第79回日本癌学会学術総会
    • Related Report
      2020 Research-status Report
  • [Presentation] トリプルネガティブ乳癌細胞のミトコンドリア構造・機能制御におけるBIG3-PHB2複合体の病態生理的役割と創薬開発2020

    • Author(s)
      相原仁、吉丸哲郎、尾野雅哉、笹三徳、三好康雄、片桐豊雅
    • Organizer
      第24回日本がん分子標的治療学会
    • Related Report
      2020 Research-status Report
  • [Presentation] BIG3-PHB2 complex integrate pathophysiological structure and function of mitochondria in triple negative breast cancer cells2020

    • Author(s)
      Hitoshi Aihara, Tetsuro Yoshimaru, Masaya Ono, Mitsunori Sasa, Yasuo Miyoshi, Toyomasa Katagiri
    • Organizer
      第43回日本分子生物学会年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Critical roles of BIG3 in mitochondrial regulation of triple negative breast cancer cells2019

    • Author(s)
      Hitoshi Aihara, Tetsuro Yoshimaru, Masaya Ono, Mitsunori Sasa, Yasuo Miyoshi, Toyomasa Katagiri
    • Organizer
      第78回日本癌学会学術総会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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